Ruling · Rādhāṣṭamī · 2013

Friday 13 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 5 min 19 s.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Thursday 12 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:12  12:00 madhyāhna ends
10:2410:4811:1211:3612:0012:2412:48

0 of 48 minutes covered

Midday of Friday 13 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:12  12:00 madhyāhna ends
Aṣṭamī ends 12:04:52
10:2410:4811:1211:3612:0012:2412:48

48 of 48 minutes covered

Aṣṭamī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 14:08 on Thu 12 Sep to 12:05 on Fri 13 Sep.

    2013-09-12T06:07:51Z → 2013-09-13T04:04:52Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:12–12:00 on the 12th, 11:12–12:00 on the 13th.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 0 of 48 minutes on the 12th and 48 of 48 on the 13th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: unstated → only-day · margin 319 s

  5. 05

    Ruling

    Rādhāṣṭamī, Daqing, 2013: Friday 13 September.

    confidence: determinate

Say it like this

In Daqing, Rādhāṣṭamī 2013 falls on Friday 13 September. Aṣṭamī runs from 14:08 on Thu 12 Sep to 12:05 on Fri 13 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2013/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 13 Sep
Ahargaṇa, classicalDisc centre, no refractionFri 13 Sep
compat-drikpanchangComparison profileFri 13 Sep
No institution has a recorded ruling for Daqing.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/radhashtami · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Aṣṭamī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“S 8 Durvastami (purvaviddha — S 8 of saura Bhadra except Bengal), Mahalaksmi vratarambha, Radhastami (madhyahna vyapini)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīMadhyāhna 12thCoveredMadhyāhna 13thCoveredRuled
Los Angeles23:08 → 21:0512:2548 min12:240 min12 Sep
Chicago01:08 → 23:0512:2248 min12:220 min12 Sep
Jersey City02:08 → 00:0512:2848 min12:280 min12 Sep
Port of Spain02:08 → 00:0511:3848 min11:380 min12 Sep
London07:08 → 05:0512:3248 min12:320 min12 Sep
Durban08:08 → 06:0511:2848 min11:280 min12 Sep
Dubai10:08 → 08:0511:5148 min11:500 min12 Sep
Delhi11:38 → 09:3511:5348 min11:530 min12 Sep
Kolkata11:38 → 09:3511:0919 min11:080 min12 Sep
Singapore14:08 → 12:0512:370 min12:370 min13 Sep
Sydney16:08 → 14:0511:280 min11:2748 min13 Sep
Suva18:08 → 16:0511:390 min11:3848 min13 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
radhashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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